Experimentally validated modeling of concrete actively confined using SMA reinforcement

Qiwen Chen, Bassem Andrawes

Research output: Contribution to conferencePaper

Abstract

Lack of sufficient confinement is one of the main reasons for reinforced concrete (RC) bridge column failures in past earthquakes. The novel seismic retrofitting technique of using Shape Memory Alloy (SMA) transverse reinforcement to actively confine RC bridge columns that lack ductility has proven its success experimentally. This innovative active confinement technique exploits the thermally activated shape memory feature of SMAs to easily and quickly apply high and permanent confinement pressure on concrete, with no need for mechanical prestressing. The unique behavior of SMA confined concrete is a combination of active confinement applied through heating the SMA spirals prior to loading, and passive confinement that develops as concrete dilates during loading. However, existing concrete constitutive models are developed either for purely active or purely passive confinement. Therefore, despite the experimental work done in this topic over the last few years, the numerical efforts are still lacking. This paper utilizes the analytical framework of the damaged plasticity model in ABAQUS along with the finite element method to predict and study the behavior of SMA confined concrete under uniaxial compressive loading. The flow rule and hardening/softening function adopted in the model are proposed as functions of confining pressure, concrete compressive strength, and plastic strain increment. Furthermore, this proposed damage plasticity model is also implemented into OpenSees as a new material model to simulate SMA confined concrete behavior for future seismic analysis. Finite element modeling in ABAQUS using the proposed damage plasticity model in predicting the behavior of SMA confined concrete shows good agreement with the test results. The novel material model for SMA confined concrete in OpenSees can closely simulate the behavior of SMA spirals confined concrete columns when compared with experimental results and is able to capture concrete stress-strain relation under combination of active and passive confinement.

Original languageEnglish (US)
DOIs
StatePublished - Jan 1 2014
Event10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering, NCEE 2014 - Anchorage, United States
Duration: Jul 21 2014Jul 25 2014

Other

Other10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering, NCEE 2014
CountryUnited States
CityAnchorage
Period7/21/147/25/14

Fingerprint

Shape memory effect
reinforcement
Reinforcement
Concretes
modeling
plasticity
Plasticity
Concrete bridges
reinforced concrete
ABAQUS
Reinforced concrete
damage
analytical framework
ductility
Prestressing
Retrofitting
confining pressure
softening
hardening
compressive strength

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Cite this

Chen, Q., & Andrawes, B. (2014). Experimentally validated modeling of concrete actively confined using SMA reinforcement. Paper presented at 10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering, NCEE 2014, Anchorage, United States. https://doi.org/10.4231/D35M6275J

Experimentally validated modeling of concrete actively confined using SMA reinforcement. / Chen, Qiwen; Andrawes, Bassem.

2014. Paper presented at 10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering, NCEE 2014, Anchorage, United States.

Research output: Contribution to conferencePaper

Chen, Q & Andrawes, B 2014, 'Experimentally validated modeling of concrete actively confined using SMA reinforcement', Paper presented at 10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering, NCEE 2014, Anchorage, United States, 7/21/14 - 7/25/14. https://doi.org/10.4231/D35M6275J
Chen Q, Andrawes B. Experimentally validated modeling of concrete actively confined using SMA reinforcement. 2014. Paper presented at 10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering, NCEE 2014, Anchorage, United States. https://doi.org/10.4231/D35M6275J
Chen, Qiwen ; Andrawes, Bassem. / Experimentally validated modeling of concrete actively confined using SMA reinforcement. Paper presented at 10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering, NCEE 2014, Anchorage, United States.
@conference{b352cf04eec447a8b60d910f783638d6,
title = "Experimentally validated modeling of concrete actively confined using SMA reinforcement",
abstract = "Lack of sufficient confinement is one of the main reasons for reinforced concrete (RC) bridge column failures in past earthquakes. The novel seismic retrofitting technique of using Shape Memory Alloy (SMA) transverse reinforcement to actively confine RC bridge columns that lack ductility has proven its success experimentally. This innovative active confinement technique exploits the thermally activated shape memory feature of SMAs to easily and quickly apply high and permanent confinement pressure on concrete, with no need for mechanical prestressing. The unique behavior of SMA confined concrete is a combination of active confinement applied through heating the SMA spirals prior to loading, and passive confinement that develops as concrete dilates during loading. However, existing concrete constitutive models are developed either for purely active or purely passive confinement. Therefore, despite the experimental work done in this topic over the last few years, the numerical efforts are still lacking. This paper utilizes the analytical framework of the damaged plasticity model in ABAQUS along with the finite element method to predict and study the behavior of SMA confined concrete under uniaxial compressive loading. The flow rule and hardening/softening function adopted in the model are proposed as functions of confining pressure, concrete compressive strength, and plastic strain increment. Furthermore, this proposed damage plasticity model is also implemented into OpenSees as a new material model to simulate SMA confined concrete behavior for future seismic analysis. Finite element modeling in ABAQUS using the proposed damage plasticity model in predicting the behavior of SMA confined concrete shows good agreement with the test results. The novel material model for SMA confined concrete in OpenSees can closely simulate the behavior of SMA spirals confined concrete columns when compared with experimental results and is able to capture concrete stress-strain relation under combination of active and passive confinement.",
author = "Qiwen Chen and Bassem Andrawes",
year = "2014",
month = "1",
day = "1",
doi = "10.4231/D35M6275J",
language = "English (US)",
note = "10th U.S. National Conference on Earthquake Engineering: Frontiers of Earthquake Engineering, NCEE 2014 ; Conference date: 21-07-2014 Through 25-07-2014",

}

TY - CONF

T1 - Experimentally validated modeling of concrete actively confined using SMA reinforcement

AU - Chen, Qiwen

AU - Andrawes, Bassem

PY - 2014/1/1

Y1 - 2014/1/1

N2 - Lack of sufficient confinement is one of the main reasons for reinforced concrete (RC) bridge column failures in past earthquakes. The novel seismic retrofitting technique of using Shape Memory Alloy (SMA) transverse reinforcement to actively confine RC bridge columns that lack ductility has proven its success experimentally. This innovative active confinement technique exploits the thermally activated shape memory feature of SMAs to easily and quickly apply high and permanent confinement pressure on concrete, with no need for mechanical prestressing. The unique behavior of SMA confined concrete is a combination of active confinement applied through heating the SMA spirals prior to loading, and passive confinement that develops as concrete dilates during loading. However, existing concrete constitutive models are developed either for purely active or purely passive confinement. Therefore, despite the experimental work done in this topic over the last few years, the numerical efforts are still lacking. This paper utilizes the analytical framework of the damaged plasticity model in ABAQUS along with the finite element method to predict and study the behavior of SMA confined concrete under uniaxial compressive loading. The flow rule and hardening/softening function adopted in the model are proposed as functions of confining pressure, concrete compressive strength, and plastic strain increment. Furthermore, this proposed damage plasticity model is also implemented into OpenSees as a new material model to simulate SMA confined concrete behavior for future seismic analysis. Finite element modeling in ABAQUS using the proposed damage plasticity model in predicting the behavior of SMA confined concrete shows good agreement with the test results. The novel material model for SMA confined concrete in OpenSees can closely simulate the behavior of SMA spirals confined concrete columns when compared with experimental results and is able to capture concrete stress-strain relation under combination of active and passive confinement.

AB - Lack of sufficient confinement is one of the main reasons for reinforced concrete (RC) bridge column failures in past earthquakes. The novel seismic retrofitting technique of using Shape Memory Alloy (SMA) transverse reinforcement to actively confine RC bridge columns that lack ductility has proven its success experimentally. This innovative active confinement technique exploits the thermally activated shape memory feature of SMAs to easily and quickly apply high and permanent confinement pressure on concrete, with no need for mechanical prestressing. The unique behavior of SMA confined concrete is a combination of active confinement applied through heating the SMA spirals prior to loading, and passive confinement that develops as concrete dilates during loading. However, existing concrete constitutive models are developed either for purely active or purely passive confinement. Therefore, despite the experimental work done in this topic over the last few years, the numerical efforts are still lacking. This paper utilizes the analytical framework of the damaged plasticity model in ABAQUS along with the finite element method to predict and study the behavior of SMA confined concrete under uniaxial compressive loading. The flow rule and hardening/softening function adopted in the model are proposed as functions of confining pressure, concrete compressive strength, and plastic strain increment. Furthermore, this proposed damage plasticity model is also implemented into OpenSees as a new material model to simulate SMA confined concrete behavior for future seismic analysis. Finite element modeling in ABAQUS using the proposed damage plasticity model in predicting the behavior of SMA confined concrete shows good agreement with the test results. The novel material model for SMA confined concrete in OpenSees can closely simulate the behavior of SMA spirals confined concrete columns when compared with experimental results and is able to capture concrete stress-strain relation under combination of active and passive confinement.

UR - http://www.scopus.com/inward/record.url?scp=84929001380&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84929001380&partnerID=8YFLogxK

U2 - 10.4231/D35M6275J

DO - 10.4231/D35M6275J

M3 - Paper

AN - SCOPUS:84929001380

ER -